[PD] implementing tooltips WAS: Pd-extended 0.43 updates: lots of new editing features

[Mathieu Bouchard]

On Tue, 12 Jul 2011, Mathieu Bouchard wrote:

> On Tue, 12 Jul 2011, Jonathan Wilkes wrote:
>
>> Mathieu Bouchard <matju at artengine.ca> wrote:
>>> EXTERN int canvas_isabstraction(t_canvas *x);
>>> declared in #include "g_canvas.h"
>> 
>> but it takes a t_canvas and I have a t_object.
>
> pd_class(x)==canvas_class ? canvas_isabstraction((t_canvas *)x) : 0;
>
> thus you check whether it makes sense to cast the pointer to t_canvas*, and 
> if it does, you call the function, otherwise you know that it's not an 
> abstraction.

sorry, pd_class(x) is just *(x), so it assumes that typeof(x) is t_pd*, or 
in other words, t_class**.

so you can write
pd_class((t_pd *)x)==canvas_class ? canvas_isabstraction((t_canvas *)x) : 0;

or just
*(t_pd *)x==canvas_class ? canvas_isabstraction((t_canvas *)x) : 0;

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| Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, Montréal, QC